Rtjdderpost of steel-concrete vessels



H. ALFSEN. RUDDERPOST OF STEEL CONCRETE VESS ELS.

APPLICATION FILED JULY 31.1918- Patented Sept. 16, 1919.

Fig. 2.

Tm: COLUMBiA PLYANOGRAPH 50.. WASHINGTON D c UNITED STATES PATENTonnron.

HAIR-ALB ALFSEN, 0F PORSGRUND, NORWAY, ASSIGNOR TO JOHN MfiLLER LARSEN,OF CHICAGO, ILLINOIS.

RUDDERPOST 0F STEEL-CONCRETE VESSELS.

Specification of Letters Patent.

Patented Sept. 16, 1919.

To all whom it may concern:

Be it known that I, HARALD ALFsEN, a subject of the King of Norway, ofPorsgrund, Norway, have invented certain new and useful Improvements inRudderposts of Steel-Concrete Vessels; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same, reference being had to the accompanying drawings,and to letters or figures of reference marked thereon, which form a partof this specification.

The present invention relates to an improvement in the rudder posts ofreinforced concrete vessels and has for its object to enable the saidrudder post to be easily changed in case of breakage or when a change ofrudder post may be desirable for other reasons, for instance owing tocorrosion or the like.

For this purpose the exterior parts of the rudder post are fastened tothe parts embedded into the body of the vessel, in a manner whichenables the exterior parts of the vessel to be changed without detrimentto the casting. The fastening may be performed by rivets, screws or byother suitable means.

A form of the invention is illustrated on the drawing.

Figure 1 is a longitudinal section through the stern of a reinforcedconcrete vessel, showing the rudder post.

Figs. 2, 3 and 4 are cross sections on the lines A-B, CD and EF of Fig.1.

As it is seen on Fig. 1 the rudder post consists of the parts 1 and 2,which are cast into the hull of the vessel, and the part 3 which isoutside the hull. This part as seen on Figs. 2 and 3 is fastened to theembedded parts by means of bolts or rivets 4, so that it may be removedor changed without removing the embedded parts 2' and 3. In order that alarge stress, such as a shock or the like shall not be liable to loosenparts 1 and 2, the part 3 is so constructed that a bregkazge will takeplace on the lines w-a or The parts of the rudder post embedded in thehull of the ship are covered as far as possible by concrete, so that nocorrosion of these parts has to be feared, and the said parts are alsoanchored in the best possible manner into the steel concrete hull.

Claims:

1. In a rudder-post for concrete vessels and the like, one or moremembers embedded into the concrete hull of the ship, and a memberconnected to the first named members outside the embedded portion and soconstructed that it will break under excessive stresses or shocks at apoint outside the connection thereby preventlng exposure of saidembedded members to dangerous shocks or stresses.

2. In a rudder post for reinforced concrete vessels and the like one ormore members embedded into the concrete hull of the ship and one memberfastened to the said first members in such a manner that it may beremoved or changed without moving the parts embedded in the concrete,said free part of the rudder post being so constructed, that in case oflarge stresses or shocks it is liable to break at a point outside theconnection with the embedded members with the object of preventingexposure of said members to dangerous shocks or stresses.

In testimony that I claim the foregoing as my invention, I have signedmy name in presence of two subscribing witnesses.

HARALD ALFSEN.

Witnesses Moenus Boson, THOMAS HERZ.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

